Diesel Generator (DG) Flashcards
What is the continuous rated KW output for Diesel generator ?
5500kw
What is the intermittent output ?
6050KW (2hr in a 24hr period)
What is the continuous rated HP output ?
7670HP
What does the DG system respond automatically to ? What does diesel generator automatically start on ?
ESFAS signal:
-Safety Injection Actuation Signal(SIAS)
-Auxiliary Feed water Actuation Signal(AFAS)
-Loss Of Power(LOP)
-Containment spray actuation signal(CSAS)
What’re the 3 modes on the selector switch ?
OFF/LOCAL/REMOTE
What is the OFF position used for ?
-Used during maintenance to inhibit automatic,local,and remote starts.
-send alarm to Local control room and Main control room
What is the Local position used for ?
-Able to manual start diesel generator
-Diesel generator will be able to start on an emergency signal
-NO remote start
What is remote start used for on selector switch?
-Can be started from Main Control room or from emergency signal
-Local manual start control panel disabled
What’re the Manual Start & Stop push buttons?
-Manual start will start DG in test mode
-Manual Stop will stop DG only if in test mode
What do the Emergency start push buttons do ?
Will start DG in emergency mode:
-Simulated LOP
-Simulated ESF actuation
What’re the Emergency Stop and Reset push buttons for ?
-Emerg. Stop button will open DG output breaker and stop it without 5 minute cooldown (Will Alarm)
-Reset button clears the stop signal to allow DG to be restarted
What’re the First Out and System reset buttons used for ?
-Reset all cleared alarms on the local DG control panel
-Verify with control room no active signals are active that’ll auto start Emerg. Mode when pressed
-First Out system provides indication, by different alarm flash sequence, of first trip signal that caused DG trip
What is the Emergency Mode interlock defeat switch for ?
Key locked control mode selector:
-OFF position allows DG to start and run in Emerg. Mode. This is normal position
-ON position returns DG to test mode from Emerg run conditions
How will the DG start on a LOP signal ?
The affected Train DG will automatically start & output breaker will auto close if conditions are met
What conditions will a LOP of power be initiated on PB bus ?
Degraded voltage- 90%(30seconds)
Under voltage- 75%(instantly)
How will the DG start on a SIAS signal ?
-Both DGS will start in Emerg. Mode in a no load standby position.
-DG output breakers stay open and must be manually closed
How will the DG start up on a Auxiliary Feed Water Actuation (AFAS)signal ?
-Both DG start up in Emerg. Mode no load, standby position
- Output breaker stay open, until manually closed
How will DG startup on a Containment Spray Actuation Signal (CSAS)?
-Both DG start in Test Mode in no load ,standby position
-Output breakers remain open and must be manually closed
How’re SIAS & CSAS signals generated ?
Generated from Containment pressure rising:
SIAS-3 psig
CSAS-8 psig
How will the DG operate while in Emergency mode ?
-Will operate in isochronous mode with frequency at 60HZ
-Emerg. Mode light will be lit on local control panel
How will DG operate if started in Test Mode?
-Will operate in droop mode,speed and voltage will be in predetermined position of DG speed and voltage adjustment potentiometer setting
How do you check what Run Mode the DG is in ?
By looking at local control panel and seeing the Emerg. Mode Light
What conditions need to be met for ESFAS load sequencer, to auto close output breaker ?
-DG at rated speed:600rpm
-DG at rated voltage: 4.16kv
-No faults on PB buses Normal or Alt. Breaker (86 lockout)
-Both Norm. & Alt. breakers for respective Train Class bus are open
-LOP signal
What’re necessary conditions for the DG output breaker to be closed locally ?
DG output breaker should only be closed on a dead bus when DG output breaker is being closed locally